Firearm



R. H. PIKE April 25, 1939.

FIREARM Filed. odt. 21, 1938 w 7 Z x m a Z if H 5 ATTORNEYS WITNESSPatented Apr. 25, 1939 UN H E D 5 earner F-F'l -CE[ Ralph H. Pike.lr'alrspelr, Mont.

Application octane-r 21, 193's, Serial N01. 236328 1. Claim. (01. 42-69)This inventionrelates" to=flrearms and moreparticularly to a triggerspring tensioning' deviceof the type described in my application forpatent entitled 'Firearm, filed January 4,- 1938,- Serial No.

183,375, Patent No. 2,143,028; January 10;- 1939'.

An object of thisinvention-isto provide a selfsetting trigger whichmaybe adjusted to any predetermined weight of pull through the medium"of'ascrew having adeep spiral thread receiving r loop of the weightcontrol' spring and adapted to emit" an" audible click every quarterturn to' announce a change in weight of pull within a preferred range offrom A pound-tomore-than- 2 pounds-insteps of about A; pound per-click.

;' A-further object isto provide apparatus" of this type which willunfailingly set itself for th'e'weight selectedeach' time the bolt isclosed and will be proof against jar-ofi' at any'weight of pull.

A further object is to provide apparatus" of thi's' type which willbeformed' ofa-few' strong simple and durable parts; which will-beinexpensive to' manufacture and which will: not easilygjet out of order.

Withthe above and other objects irr viewtheinvention consists ofcertainnovel-det'ails ofcon' struction and combinations of partshereinafteriully described and: claimed; it being understood thatvarious modifications may be resorted to within the scope of theappended claim without departing from thespirit or sacrificingany'of theadvantages of the invention.

In the accompanying drawingforming'part' of" thisspecificatiQn,

Figure 1 is a side elevation of a bolt action'rifie";

.with' portions broken away, to expose a trigger spring tensioningdevice constructed in accordance with the invention.

Figure 2 is a fragmentary plan view of the trigger guard plate and partscarried thereby including the flipper, trigger, and control springs.

Figure 3 is a perspective view of the trigger, weight controlled screwand control springs.

Figure 4 is a perspective view of the sear.

Figure 5 is a perspective view of the sear extension finger.

Figure 6 is a perspective view of the flipper, and its resetting spring.

Figure '7 is a perspective view of the weight controlled screw.

5 Referring now to the drawing in which like characters of referencedesignate similar parts in the various views, Ill designates a boltaction rifle.

In carrying out the invention a substantially straight sear H isprovided on the top near the forward end with a hinge eye [2 to which ahinge mue f3 is passedinto the side plates of the lock mechanism: Ahelical spring I; is housed'in arecess ['5 formedip" the topof thecompartment and bears-upon the topof the front end of the"seartowonstantly urge the" rearend" of the sear 5 upwardly.

The rear end of the sear is provided with a shoulder [G -which isb'eveled at the" rear corner to provide an abutment face ll which"engages a beveled abutr'nent face f8 on the front lower edge" 10 ofthe"cocking 'pi'e'c'e nosa [9. The beveled faces l 1 an'd l8 are encli'nedat" an angle of" about 30 degreesrelativettrthe axis ofthe-barrel sothat wlien'thebolt lllis cocked"- there will exist" a forward componentof" force ali'dialSO'a downward: 16-" component of force-at the constantfaces. The downw'ard component of force tends-- to force the seardownwardly and is resisted by" the searextension finger 2 1.

'Ihe'sear extension finger-2l is-receivedat" the 20% upper end betweenhinge ears 22 which extend downwardly fromthebottom of therearend' ofthe scar; and apivo'tpin 23 is" passed through tliefinger and ears-topivotally mount the finger oathesear; Thetop face' of thefinge'r isspaced 25 fromthebottomiace o'f the sear to. provide sufiicient'clearance for thefinger to pivot relatively tothesearz- A" helicalspring M ismountedin a vertically extending opening 25 in the bottomfaceof thasear 'and bearsagainst the top" face of the extension finger"forwardly of its pivot piir-23 to ho-ld' tl'iefinger in engagement-withtheflipper-26.

The flipper 26 is substantially triangular in' contour" and is--providedwith two upperfaces 5'. 2"! and 28 01 respectively difierent gentleslopes forming a shoulder 29 between them against which the lower end ofthe sear extension finger is lodged. The flipper is provided with arearwardly extending finger 30 having a longitudi- 40 nal slot 3|therein, the rear wall 32 of the slot being sloped downwardly andrearwardly to slidably receive a similarly shaped surface 33 on thetrigger when a hook 34 on the trigger is engaged with the top face ofthe finger 30, with a lap 4-5 of about of an inch, to securely lock theflipper against downward thrust of the sear extension finger until thetrigger is pulled.

The flipper is normally held in position to receive the sear extensionfinger through the meso dium of a U-shaped spring 35 which is engaged ina notch 36 in the rear face of the flipper and has legs looped around apivot pin 31 which is passed through the flipper and into the top plate38 of the trigger guard 39. The free ends of 5;,

recess.

the legs extend forwardly from the pivot pin and bear against the topplate of the trigger guard. Pressure of the spring on the flipperinstantly returns the flipper to normal position after each actuation bythe trigger.

The trigger is provided with a finger 4| which underlies the finger 26of the-flipper. A pivot pin 42 is passed through the finger and into thetop plate 38 of the trigger guard to pivotally mount the trigger. AU-shaped spring 43 is engaged in a notch 44 in the top face of theflnger 4| and the legs are trained underneath the pivot pin 42 anddirected forwardly to bear at the free ends against the top plate 38 ofthe trigger guard. The spring exerts a rearward pressure upon thetrigger rearwardly of the pivot pin 42 to assist the weight springhereinafter described in returning the trigger to normal position toengage the hook 34 with the flipper after each actuation.

The front face of the trigger is cut away to provide a recess 45 inwhich is rotatably mounted a weight control screw 46 having a deep wormthread 4'1. The screw inclines rearwardly in the A U-shapedweightcontrol spring 48 is engaged with the thread of the screw and the legsare passed rearwardly and looped around the pivot pin 42 of the trigger,thence directed forwardly to bear with the free ends of the top plate 28of the trigger guard. This spring resists pull upon the trigger andcontrols the weight wardly or upwardly on the thread of the screw torespectively increase or diminish the tension of the spring andcorrespondingly vary the Weight of pull required to actuate the triggerand dislodge the sear extension finger 2| from the flipper.

A continuous groove 50 is formed circumferentially in the head of thescrew as best shown in Figure 7 and preferably four equally spacednotches 5| are formed in the bottom of the groove. The groove receives aplunger 52, best shown in Figure 1, which is mounted in a recess 53formed in the trigger at a right angle to the axis of the weight controlscrew 46. A helical spring 54 is disposed in rear of the plunger and isheld under tension against the plunger through the medium of a screwplug 55 which closes the outer end of the recess. The plunger drops intothe notches 5| successively as the screw is rotated and provides fourdefinite stops per turn of the screw with respective audible clicks asthe plunger rides from the groove into the notches. These stops can alsobe felt through the screw driver at the completion of each quarter turnof the screw.

Behind the trigger a screw 56 is threadedly engaged in a recess 5!formed in the trigger guard and bears against the lower face of thefinger 4| in rear of the pivot pin 42. By screwing the screw 46 in orout the creep or overlap of the hook 34 of the trigger with the finger26 of the flipper may be adjusted.

When the trigger is pulled against the tension of the weight controlspring 48, downward pressure of the sear extension finger 2| turns theflipper slightly, as indicated by the arrowheads in Figure 1, and thusdislodges the sear extension finger from the shoulder 29. The sear beingthus released the cooking nose I 9 passes instantly over the shoulder l6of the sear to fire the gun. Immediately after the dislodgement of thesear extension finger the controlling spring 35 of the flipper returnsthe flipper to normal position.

The trigger cannot be pressed rearwardly enough to interfere with theoperation as the upper face of the finger 4| contacts the stock, or thelower end of the trigger contacts the guard.

From the above description it is thought that the construction andoperation of the invention wil be fully understood without furtherexplanation.

What is claimed is:

In a firearm, a pivoted spring pressed trigger, a pivoted spring pressedflipper, interlocking means between the trigger and flipper yieldablyholding the flipper in set position, a sear, interlocking means betweenthe sear and flipper engageable by movement of the flipper under impulseof the trigger, after release of the first named interlocking means torelease the sear, a weight control spring connected to the trigger andexerting pressure against the trigger to hold the first namedinterlocking means in operative position, a weight control screw havinga worm thread engaging said spring to vary tension on the spring, saidscrew having a head provided with a circumferential groove, there beingnotches in the bottom of said groove, and a spring pressed plungerdisposed laterally of the screw head and engageable in said groove andnotches to provide audible clicks as the plunger rides from the groovesinto the notches during rotation of the screw.

RALPH H. PIKE.

